<stddef.h>
Include the standard header <stddef.h>
to define several types and macros that are
of general use throughout the program. The
standard header <stddef.h>
is available even in a
freestanding implementation.
/* MACROS */ #define NULL <either 0, 0L, or (void *)0> [0 in C++] #define offsetof(s-type, mbr) <size_t constant expression> /* TYPES */ typedef si-type ptrdiff_t; typedef ui-type size_t; typedef i-type wchar_t; [keyword in C++]
NULL
#define NULL <either 0, 0L, or (void *)0> [0 in C++]
The macro yields a null pointer constant that is usable as an address constant expression.
offsetof
#define offsetof(s-type, mbr) <size_t constant expression>
The macro yields the offset in bytes, of type
size_t
,
of member mbr
from
the beginning of structure type s-type
,
where for X
of type s-type
,
&X.mbr
is an
address constant expression.
ptrdiff_t
typedef si-type ptrdiff_t;
The type is the signed integer type si-type
of an object that you declare to store the result of
subtracting two pointers.
size_t
typedef ui-type size_t;
The type is the unsigned integer type ui-type
of an object that you declare to store the result of the
sizeof operator.
wchar_t
typedef i-type wchar_t; [keyword in C++]
The type is the integer type i-type
of a
wide-character constant, such as L'X'
.
You declare an object of type wchar_t
to hold a
wide character.
See also the Table of Contents and the Index.
Copyright © 1989-2002 by P.J. Plauger and Jim Brodie. All rights reserved.